Fix OSX 10.12 compilation errors in chrome/browser/ui.

chrome/browser/ui/cocoa/confirm_quit_panel_controller.mm

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import <Cocoa/Cocoa.h>
 #import <QuartzCore/QuartzCore.h>
 
 #import "chrome/browser/ui/cocoa/confirm_quit_panel_controller.h"
 
 #include "base/logging.h"
 #include "base/mac/scoped_nsobject.h"
+#import "base/mac/sdk_forward_declarations.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/cocoa/confirm_quit.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/grit/generated_resources.h"
 #include "components/prefs/pref_registry_simple.h"
@@ skipping 140 matching lines @@
 
 - (void)animationDidStop:(NSAnimation*)anim {
   DCHECK_EQ(self, anim);
   [self autorelease];
 }
 
 @end
 
 // Private Interface ///////////////////////////////////////////////////////////
 
-@interface ConfirmQuitPanelController (Private)
+@interface ConfirmQuitPanelController (Private) <CAAnimationDelegate>
 - (void)animateFadeOut;
 - (NSEvent*)pumpEventQueueForKeyUp:(NSApplication*)app untilDate:(NSDate*)date;
 - (void)hideAllWindowsForApplication:(NSApplication*)app
                         withDuration:(NSTimeInterval)duration;
 // Returns the Accelerator for the Quit menu item.
 + (std::unique_ptr<ui::PlatformAcceleratorCocoa>)quitAccelerator;
 @end
 
 ConfirmQuitPanelController* g_confirmQuitPanelController = nil;
 
@@ skipping 165 matching lines @@
       [[window animationForKey:@"alphaValue"] copy]);
   [animation setDelegate:self];
   [animation setDuration:0.2];
   NSMutableDictionary* dictionary =
       [NSMutableDictionary dictionaryWithDictionary:[window animations]];
   [dictionary setObject:animation forKey:@"alphaValue"];
   [window setAnimations:dictionary];
   [[window animator] setAlphaValue:0.0];
 }
 
+- (void)animationDidStart:(CAAnimation*)theAnimation {
+  // CAAnimationDelegate method added on OSX 10.12.
+}
+
 - (void)animationDidStop:(CAAnimation*)theAnimation finished:(BOOL)finished {
   [self close];
 }
 
 // This looks at the Main Menu and determines what the user has set as the
 // key combination for quit. It then gets the modifiers and builds a string
 // to display them.
 + (NSString*)keyCommandString {
   std::unique_ptr<ui::PlatformAcceleratorCocoa> accelerator(
       [self quitAccelerator]);
@@ skipping 50 matching lines @@
   if (modifiers & NSAlternateKeyMask)
     [string appendString:@"\u2325"];
   if (modifiers & NSShiftKeyMask)
     [string appendString:@"\u21E7"];
 
   [string appendString:[item.characters() uppercaseString]];
   return string;
 }
 
 @end